SP500215 Combination of Multiple Searches chapter E. Fox J. Shaw National Institute of Standards and Technology D. K. Harman Table 8: Average (Ad-hoc Topics 51-100). Precision and Exact R-Precision for CombSUM runs combining two or three individual runs Average Precision Run AP-1 wsJ-1 AP-2 WSJ-2 AP-l SV 0.2387 0.2203 0.2543 0.1503 0.2624 LV 0.2435 0.2414 0.2664 0.1633 0.2672 Pnl.0 0.2810 0.2941 0.3004 0.2206 0.2688 Pnl.5 0.3122 0.3199 0.3332 0.2327 0.2976 Pn2.0 0.3027 0.3217 0.3300 0.2325 0.2968 ;½ R- Precision AP-2 0.2649 wsJ-1 0.2616 WSJ-2 0.1744 0.2800 0.2704 0.1860 0.3221 0.3165 0.2367 0.3443 0.3412 0.2511 0.3470 0.3339 ¾; 0.2442 SV and LV 0.1457 0.1657 0.1611 0.1100 0.1492 0.1887 0.1524 0.1124 SV and Pnl.0 0.2774 0.3111 0.3257 0.2362 0.2874 0.3332 0.3360 0.2554 SV and Pnl.5 0.3117 0.3389 0.3614 0.2463 0.3198 0.3575 0.3675 0.2637 SV and Pn2.0 0.3012 0.3395 0.3584 0.2467 0.3153 0.3580 0.3636 0.2551 LV and Pnl.0 0.2744 0.3136 0.3197 0.2353 0.2867 0.3357 0.3269 0.2518 LV and Pnl.5 0.3057 0.3413 0.3536 0.2442 0.3181 0.3596 0.3624 0.2568 LV and Pn2.0 0.2950 0.3408 0.3518 0.2458 0.3141 0.3608 0.3596 0.2615 Pnl.0 and Pnl.5 0.2817 0.3109 0.3243 0.2324 0.2898 0.3412 0.3395 0.2476 Pnl.0 and Pn2.0 0.2935 0.3191 0.3330 0.2367 0.2944 0.3426 0.3397 0.2507 Pnl.5 and Pn2.0 0.2928 0.3233 0.3336 0.2328 0.2935 0.3478 0.3351 0.2489 Pnl.0, Pnl.5 and Pn2.0 0.2943 0.3192 0.3345 0.2339 0.2953 0.3421 0.3386 0.2497 (TREC-1), D.K. Harmon (Ed.), National Institute of Standards and Technology Special Publication 500-207, Gaithersburg, MD. [5] Katzer, J., McGill, M.J., Tessier, J.A., Frakes, W., Dasgupta, P. (1982). A Study of the Overlap among Document Representations. Inform ajion Technol- ogy: Reseach and Developmeni, 1(2) :261-274. [6] Thompson, P. (1990) A Combination of Expert Opinion approach to probabilistic information re- trieval, Part 1: The conceptual model. Informa[OCRerr]ion Processing [OCRerr] Managemeni, 26(3):371-382, 1990. [7] Thompson, P. (1990). A Combination of Expert Opinion approach to probabilistic information re- trieval, Part 2: Mathematical treatment of CEO Model 3. Informalion Processing [OCRerr] Managemeni, 26(3) :383-394. 249